Brexit is 'not a good omen' for one of the largest carmakers in the world

London mayor Boris Johnson arrives to speak at a Conservative Party election rally in Hendon on May 5, 2015 in Twickenham, London. Britain will go to the polls in a national election in just two days time. Toby Melville - WPA Pool /Getty Images General Motors said economic "headwinds" from the UK's vote to leave the European Union may cost the company $400 million (£300 million).

The company said it may cut costs across Europe to deal with the depreciating Pound and economic uncertainty after the June vote, according to a BBC News report.

General Motors posted record second-quarter earnings on Thursday - $1.86 per share ($1.81 diluted), on net revenue of $42.4 billion - but warned on the prospects in British and European car markets.

Karl-Thomas Neumann, the chief executive of Opel, a GM brand, described Brexit as "not a good omen" for the company in Europe, according to the BBC.

He posted a video on Twitter in which he said the company was "facing strong headwinds at the moment, particularly in our largest market - the United Kingdom."

The UK is risking a period of economic uncertainty and the loss of its financial services passport, which can be used by banks based in London to sell services across the EU.